Commentary (A Step Farther Out: Part Four: Space Travel)
| First published | September 1979 |
|---|---|
| Type | Essay |
| Series | A Step Farther Out › Commentary (A Step Farther Out) #4 |
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| September 1979 |
|
A Step Farther Out | Ace Books | Nonfiction | 190 |
| July 1980 |
|
A Step Farther Out | W. H. Allen | Nonfiction | |
| August 1980 |
|
A Step Farther Out | Ace Books | Nonfiction | 190 |
| March 1984 |
|
A Step Farther Out | Ace Books | Nonfiction | 190 |